Wide Application--This Replacement pack is an essential quilting suplly and craft accessory. Our cutter blades have dozens of uses. These ultra blades easily cuts through fabric, foam, fleece, felt, vinyl, leather, cardboard, wallpaper, and more. Perfect for any quilting or scrapbooking project. Applicability--Compatible with ALL 45mm cutters. Suitable for--These will cut with spaces roughly 1/4" apart from each other. Great for fleece and other material for crochet edge blankets, as well as scrap booking designs. High Speed Steel--Made from high-quality SKS-7 Carbide Tools Steel for blades that stay sharper and last longer! Pre-lubricated to Prevent Rusting and Corroding. Storage Case--Store your blades in the included FREE snap case.